Originals lasted well and expect these to do the same. Even well worn they continued to perform well.

Brian Hay

These chain rings were original equipment on my Lapierre Zesty 2011 they have lasted through three winters of mud and slush. Compared with Shimano's standard Deore chain rings as were fitted on my Merlin Malt1,which only lasted 18 months = 1 winter. Therefore, I'm impressed with the long lasting qualities of the M660's. Smooth shifts and performs as expected.

Mr benn

As normal exertlent service from merlin cycles
And shimano parts are second to none

Mr WALKER

Genuine shimano chain rings at a great price and merlin's great service i don't mind changeing them evey nine months on average

Jods

Very light and Durable

Mr mills

Very good value for money

Mr Watson

There is no compromise in economizing, SLX shifts every bit as well as XT and much longer lasting too as steel not soft alloy.